The Materials Science of Coatings and Substrates Part 15 potx

... 3, 4 141, 150 , 153 -161 Ag - 161 Au-CU - 155 CO - 156 Cr - 141, 157 electroless Ni - 153 , 154 Si - 157 Sn-Ni - 155 steel - 157 CU - 157 -160 Pd - 156 Miller indices ... T. Game and U. Ma, "Wear Mechanisms in Electroless Nickel Coatings& quot;, Wear, 120, 125 (1987). D. T. Game and U. Ma, "Friction and Wear of Chromium and...

Ngày tải lên: 10/08/2014, 12:21

... composition of products and expanded use of computers in modeling behavior of materials. According to the report: " ;The field of materials science and engineering is entering a period of unprecedented ... 11. Materials Science and Engineering for the 1990's-Maintaining Competitiveness in the Age of Materials, By the Committee on Materials...

Ngày tải lên: 10/08/2014, 12:21

... of hydrogen absorbed are the composition and metallurgical structure of the alloy, the composition and temperature of the etching solution, the etching time, the sequence in which the ... is greater than that of the rod but less than that of the rod and the coating. The bond strength can be calculated by using the load to cause failure and the...

Ngày tải lên: 10/08/2014, 12:21

... clearly show the importance of the mechanical roughening (sandblasting) part of the process. Without the mechanical roughening step, the subse- quent anodic etch was extremely non-uniform and adhesion ... shows the comparison of the experimental peel strength for chromium films on a silicon substrate and theoretical values predicted by taking the strain-harden...

Ngày tải lên: 10/08/2014, 12:21

... indicator of ductility is measurement of the reduction of area of the sample rather than elongation (17). Reduction of area is largely a measure of the inherent ultimate ductility of a material ... 2/3 the melting point of the lower melting point material in the joint. Use of elevated temperature serves to accelerate comingling of atoms at the joint in...

Ngày tải lên: 10/08/2014, 12:21

... texture and fractals. STRUCTURE OF ELECTRODEPOSITED AND ELECTROLESS COATINGS The properties of all materials are determined by their structure. Even minor structural differences often have profound ... cause the formation of this type of structure (7). The grain sizes in deposits of this type are of the order of lo-’ to cm. These deposits are usually rel...

Ngày tải lên: 10/08/2014, 12:21

... their properties. The rate of the phenomenon depends largely on the nature of the metals, the attacking gases, and the new products that may form at the interface between the two phases (39). ... cally unstable and converts to a phase with the release of hydrogen and causes a contraction of the lattice and cracking of the deposit. Deposits wit...

Ngày tải lên: 10/08/2014, 12:21

... a much better understanding of the science governing the mechanisms and functions of additives for plating solutions, much of the work has been of the "trial and error" or Edisonian ... copper they hew they had to have a better understanding about its operation other than the simple fact that it leached something from the oak. They challenged thei...

Ngày tải lên: 10/08/2014, 12:21

... susceptibility to the effect of additives, and the order of this susceptibility is roughly the same as the order of their melting points, hardness and strength; it increases in the order Pb, ... shows the build up of these two decomposition products as a function of solution electrolysis time and their influence on stress in the deposit. In the ca...

Ngày tải lên: 10/08/2014, 12:21

... 3) the accumulation of aging byproducts; 4) the form of current and the current density used for deposition; 5) the degree of agitation; and 6) the temperature of the solution. Extensive ... thicker plates (27). The direction of the change as a function of thiclaiess depends on the microthrowing power of the solution, and is therefore, specifi...

Ngày tải lên: 10/08/2014, 12:21